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detect and implement inplace permutations

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This commit is contained in:
Gael Guennebaud
2010-02-25 16:30:58 +01:00
parent d9ca0c0d36
commit 959a1b5d63
6 changed files with 78 additions and 40 deletions
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18
Eigen/src/Core/util/BlasUtil.h
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@@ -236,4 +236,22 @@ struct ei_blas_traits<Transpose<NestedXpr> >
static inline Scalar extractScalarFactor(const XprType& x) { return Base::extractScalarFactor(x.nestedExpression()); }
};
template<typename T, int Access=ei_blas_traits<T>::ActualAccess>
struct ei_extract_data_selector {
static const typename T::Scalar* run(const T& m)
{
return &ei_blas_traits<T>::extract(m).const_cast_derived().coeffRef(0,0); // FIXME this should be .data()
}
};
template<typename T>
struct ei_extract_data_selector<T,NoDirectAccess> {
static typename T::Scalar* run(const T&) { return 0; }
};
template<typename T> const typename T::Scalar* ei_extract_data(const T& m)
{
return ei_extract_data_selector<T>::run(m);
}
#endif // EIGEN_BLASUTIL_H